These data were collected as part of a survey of the bottom sediments of Georges Bank. The purpose of the survey was to provide basic data for use in studying the relationships between substrate composition and the occurrence of benthic animals, especially those which are common foods of fishes. Particle size composition was the principal sediment character that was studied.

Purpose:

The purpose of this data layer is to release a digital version of the sediment data published in Wigley (1965).

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 1961

Currentness_Reference: publication date

Status:

Progress: Complete

Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -69.783300

East_Bounding_Coordinate: -65.500000

North_Bounding_Coordinate: 42.366700

South_Bounding_Coordinate: 40.150000

Keywords:

Theme:

Theme_Keyword_Thesaurus: General

Theme_Keyword: U.S. Geological Survey

Theme_Keyword: USGS

Theme_Keyword: Coastal and Marine Geology Program

Theme_Keyword: CMGP

Theme_Keyword: Woods Hole Field Center

Theme_Keyword: ArcView

Theme_Keyword: point shapefile

Theme_Keyword: grab

Theme_Keyword: Smith-McIntyre Grab

Theme_Keyword: sediment

Theme_Keyword: GIS

Theme_Keyword: National Assessment of Marine Sand and Gravel Resources

All attributes were entered and checked by the compilers in a consistent manner.

Logical_Consistency_Report:

No additional checks for topological consistency were performed on this data.

Completeness_Report:

Sample locations and textural classifications are provided for 223 stations.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

No navigational methods are provided in the original publication. Horizontal accuracy is unknown.

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report: Tides are less than 2 m.

Quantitative_Vertical_Positional_Accuracy_Assessment:

Vertical_Positional_Accuracy_Value: 2

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator: R.L. Wigley

Publication_Date: 1961

Title: Bottom Sediments of Georges Bank

Edition: 1.0

Series_Information:

Series_Name: Journal of Sedimentary Petrology

Issue_Identification: v. 31, no. 2, p. 165-188

Type_of_Source_Media: paper

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 1961

Source_Currentness_Reference: publication date

Source_Contribution:

Summarized tabular data from the report were converted to an ASCII text file.

Process_Step:

Process_Description:

The source information was manually entered into digital form and was imported from an ASCII text file to an ArcView table. The table was later converted to an event theme in ArcView and saved as the final shapefile.

Source_Used_Citation_Abbreviation: wigley61.txt

Process_Date: 20020909

Source_Produced_Citation_Abbreviation: wigley61.shp

Source_Produced_Citation_Abbreviation: wigley61.dbf

Source_Produced_Citation_Abbreviation: wigley.shx

Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Lawrence J. Poppe

Contact_Organization: U.S. Geological Survey

Contact_Position: Geologist

Contact_Address:

Address_Type: mailing and physical address

Address: 384 Woods Hole Road

City: Woods Hole

State_or_Province: MA

Postal_Code: 02543-1598

Country: USA

Contact_Voice_Telephone: 508-548-8700 x2314

Contact_Facsimile_Telephone: 508-457-2310

Contact_Electronic_Mail_Address: lpoppe@usgs.gov

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Vector

Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: Entity point

Point_and_Vector_Object_Count: 223

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Geographic:

Latitude_Resolution: 0.0001

Longitude_Resolution: 0.0001

Geographic_Coordinate_Units: Decimal degrees

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1927

Ellipsoid_Name: Clarke 1866

Semi-major_Axis: 6378206.400000

Denominator_of_Flattening_Ratio: 294.978698

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: wigley61.dbf

Entity_Type_Definition: Shapefile Attribute Table

Entity_Type_Definition_Source: ESRI

Attribute:

Attribute_Label: FID

Attribute_Definition: Internal feature number.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain:

Sequential unique whole numbers that are automatically generated.

Attribute:

Attribute_Label: Shape

Attribute_Definition: Feature geometry.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Coordinates defining the features.

Attribute:

Attribute_Label: PROJECT_ID

Attribute_Definition: Project id assigned to the data set for future identification.

Attribute_Definition_Source: Compiler

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: WIGLEY1961

Enumerated_Domain_Value_Definition: Scientist and year of publication.

Enumerated_Domain_Value_Definition_Source: Compiler

Attribute:

Attribute_Label: VESSEL

Attribute_Definition: Ship aboard which the samples were collected.

Attribute_Definition_Source: Scientist

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: ALBATROSSIII

Enumerated_Domain_Value_Definition: Ship

Enumerated_Domain_Value_Definition_Source: Scientist

Attribute:

Attribute_Label: DATE

Attribute_Definition: Dates during which samples were collected.

Attribute_Definition_Source: Scientist

Attribute_Domain_Values:

Unrepresentable_Domain:

Character string containing range of date during which the samples were obtained.

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: 8/20-30/1957

Enumerated_Domain_Value_Definition:

Range of dates (M/DD-DD/YYYY) during which samples were obtained.

Enumerated_Domain_Value_Definition_Source: Scientist

Attribute:

Attribute_Label: STATION_ID

Attribute_Definition: Number assigned to each station where a sample was collected.

Attribute_Definition_Source: Scientist

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 1

Range_Domain_Maximum: 229

Attribute_Units_of_Measure: integer count

Attribute_Measurement_Resolution: 1

Attribute:

Attribute_Label: DEVICE

Attribute_Definition: Device with which the samples were collected.

Attribute_Definition_Source: Scientist

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: SMITH-MCINTYRE GRAB

Enumerated_Domain_Value_Definition: Smith-McIntyre grab sampler

Enumerated_Domain_Value_Definition_Source: Scientist

Attribute:

Attribute_Label: LATITUDE

Attribute_Definition: Latitude coordinate of sample location.

Attribute_Definition_Source: Scientist

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 40.1500

Range_Domain_Maximum: 42.3667

Attribute_Units_of_Measure: Decimal degrees

Attribute_Measurement_Resolution: 0.0001

Attribute:

Attribute_Label: LONGITUDE

Attribute_Definition: Longitude of sample location.

Attribute_Definition_Source: Scientist

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -69.7833

Range_Domain_Maximum: -65.5000

Attribute_Units_of_Measure: Decimal degrees

Attribute_Measurement_Resolution: 0.0001

Attribute:

Attribute_Label: TEXTURE

Attribute_Definition:

Textural classification according to the scheme devised by Shepard (1954)

Attribute_Definition_Source: Compiler

Attribute_Domain_Values:

Unrepresentable_Domain:

Character string containing the verbal equivalents of the classification scheme.

Although this data set has been used by the U.S. Geological Survey, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and/or related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data or related materials.

The user must have a computer system with a CD-ROM available. To browse the information contained on this CD-ROM, the user must have a current WWW browser available. The user must also have software installed on their computer to unzip the archived file.

Technical_Prerequisites:

The data is available in ArcView shapefile format. The user must have ESRI's ArcView 3.0 or greater software to read and process the data file. In lieu of ArcView, the user may utilize another GIS application package capable of importing the data.